Below you will find all of the 12 volt 10Si type alternators we carry. You will first find the negative ground section, followed by the positive ground section. Both contain the regular and chrome units, the 105 ampere models on the left and the 140 ampere models on the right. The 12 volt Delco Remy 10Si model alternator is most common with cars and trucks, very few tractors run 12 volt. Many people will, however, convert their existing 6 volt systems to 12 volt, to make finding and repairing the alternator easier. This is quite a process and requires changes to lights, gauges, battery wires and some other electrical components.